243901129 has 2 divisors, whose sum is σ = 243901130. Its totient is φ = 243901128.

The previous prime is 243901127. The next prime is 243901139. The reversal of 243901129 is 921109342.

243901129 = T₁₂₇₅₀ + T₁₂₇₅₁ + T₁₂₇₅₂.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233325625 + 10575504 = 15275^2 + 3252^2 .

It is a cyclic number.

It is not a de Polignac number, because 243901129 - 2¹ = 243901127 is a prime.

Together with 243901127, it forms a pair of twin primes.

It is equal to p_13363564 and since 243901129 and 13363564 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243901129.

It is not a weakly prime, because it can be changed into another prime (243901123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121950564 + 121950565.

It is an arithmetic number, because the mean of its divisors is an integer number (121950565).

Almost surely, 2^243901129 is an apocalyptic number.

243901129 is the 12752-nd centered triangular number.

It is an amenable number.

243901129 is a deficient number, since it is larger than the sum of its proper divisors (1).

243901129 is an equidigital number, since it uses as much as digits as its factorization.

243901129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 243901129 is about 15617.3342475597. The cubic root of 243901129 is about 624.7955632163.

The spelling of 243901129 in words is "two hundred forty-three million, nine hundred one thousand, one hundred twenty-nine".